Cylindrical door-lock



Aug. 10, 1965 A. K. NHLOLA CYLINDRICAL DOOR-LOCK Filed Jan. 22, 1963 United States Patent Ofiice 3,l9,323 Patented Aug. 10, 1%65 3,199,323 CYLINDRIBCAL DOOR-LOCK Armas Kalervo Niiioia, Sornaisten Rantatie 9-11, Helsinki, Finland Filed Jan. 22, 1963, Ser. No. 253,096 1 Claim. ((11. 70367) This invention relates to a cylindrical doorlock of the type comprising a lock-cylinder provided with loclo :plates. The look-cylinder is detachably arrange-d m a cylindrical casing so that it is secured in the casing by means of a detachable catch device which is arranged at the open end of the casing through which the lock-cylinder is fitted.

The invention relates more particularly to the manner of fastening of the lock-cylinder into the casing.

According to the constructions of the known cylindrical locks of this type, the lock-cylinder is held in its place by means of a spring plate, which by means of its bi furcated free end is arranged to press against the lock cylinder so that it is pressed against the bottom of the casing. The other end of the spring plate is fastened in a protrusion at the open end of the casing by means of a screw.

This manner of fastening, which is employed in the conventional cylindrical locks, has, however, certain disadvantages. in using a spring plate, which by means of a screw can be fastened in the casing, it is first required, that the casing be provided with a necessary protrusion for the fastening screw. Firstly, the protrusion is provided with a bored hole which must be threaded. Secon-dly, it is required that a suitable securing screw be used.

Because the boring and threading of the hole as well as the manufacture of the securing screw cannot be performed simultaneously with the other operations during manufacture of the casing, but must take place separately as additional working operation, the above stated manner of fastening makes the manufacturing of the cylindrical door-lock fairly complicated. It even happens that the securing screw works loose on account of the door being 'banged too hard. In such a case the lock-cylinder may fall out from the casing, or the lock-plates may shift their position in the lock-cylinder and thus assume an improper position relative their mutual distance from one another. Accordingly, the plates no longer come into mutual connection with each other and their notches no longer correspond with those of the key.

The present invention has as an object the elimination of the above stated disadvantages. The door-lock according to the invention is mainly characterized by an internal peripheral groove at the free end of the easing, into which is fitted a radially resilient springelement acting as a stopper .for the lock-cylinder.

According to the present invention there a cylindrical lock, which as to mounting is simpler than the locks produced earlier. For fastening of the lock-cylinder into the casing there is only needed a normal spring washer, e.g. a standard type, which is engageable in an internal groove in the casing, which can be cut at the time of the turning of the inner surface of the casing. Therefore, there is a quite considerable saving of material and work, because the projection in the casing and the neces sary securing screw are then unnecessary and also because there is obtained a simpler mounting means, as the spring-ring easily engages into the groove and remains in engagement in the groove without the need for any further means.

According to one very advantageous embodiment of the invention the cylindrical door-lock is characterized in is provided its manufacture and of the cylindrical type that the ring-element, besides its radial resiliency, l axially resilient and that the cut out groove has a slightly greater width than the thickness of the IlIlg:lIIlIlli, thus the ring-element can resiliently press against the l0ckcylinder in order to press the cylinder against the bottom of the casing. in the above manner there is gained the advantage that the position of the cut out groove in the casing in relation to the end of the look-cylinder, again-st which the spring-element is intended to rest, need not be absolutely exact and can thus vary to some extent, whereby the cutting of the groove need not be absolutely precise and can be performed easily and quickly. Although the position of the groove may vary, the lock-cylinder becomes in this way always securely locked into the casing with a slight axial resilient movement.

The invention is described more freely in the following description taken with reference to the accompanying drawing, in which FIGURE 1 shows an axial section of a cylindrical lock according to a preferred embodiment of the invention, and

F-IGURE 2 shows the lock as seen in the axial direction, i.e., as seen from above in FIGURE 1.

The lock shown in the drawing comprises a cylindrical casing 1 with a likewise cylindrical opening, one end of which is closed by the bottom 2 of the casing 1. The casing 1 is at its bottom fastened by means of a retaining ring to a nose 3 for attaching the casing 1 to a door or the like. Inside, the casing 1 is fitted a lock-cylinder 4, which is provided with a number of tumblers or lockplates 5, and further with a radially moving lock-rod 6 and spring 6a. The lock-cylinder 4 can be pushed into the casing 1 through its upper open end 7 so that the lock-cylinder t rests against the bottom of the casing 1, as shown in FIGURE 1. The numeral 8 designates a key placed in the lock and numeral 9 designates a rod fastened to the lock-cylinder t such that it turns together with the latter in order to op rate the lock mechanism (not shown in the drawing).

order to keep the lock-cylinder 4 secured in the Cas ng :1 the latter is provided with a peripheral, internal groove 10 and with a one turn helical spring-ring 11. The edge part of spring-ring 11 is fitted into the groove ill. The spring-ring 1-1 is provided with two lugs 12, by which means ring 11 can be drawn together radially so that it can be fitted into groove 10 or removed therefrom. The position of groove 10 in the casing 1 is arranged in relation to the lock-cylinder 4 in such a Way that when the spring-ring 1"} is in engagement with groove 10 it is pressed against the end of the lock-cylinder 4, thus preventing the cylinder from moving in axial direction.

As shown in FIGURE 1, the groove 10 has a slightly greater width than the thickness of the spring-ring 11. Therefore, there is gained the advantage that the position of the groove in relation to the end of the lock-cylinder 4, against which the spring 1-1 is intended to rest, need not be absolutely exact and can thus vary to some extent. 'Hence, the cutting of the groove 10 can be eifccted easily and quickly. The lock-cylinder 4 will in any event be securely locked into the casing 1 with but a slight axial resilient movement.

The drawing and the corresponding part of the speciiication are, of course, only intended to illustrate the idea. of the invention. The construction of the lock with regard to its details can thus depart considerably within the scope and limits stated in the following claim.

What I claim is:

A cylindrical door lock comprising a stationary hollow cylindrical casing including a partially closed first end portion, an open second end portion and an internal wall portion, said casing having a circumferential groove in said internal wall portion adjacent said open end por- "latter against said first end portion of said hollow cylindrical casing, said ring including opposite ends and being helical in shapes-and extending along substantially one turn such that the ends are substantially adjacent one :another but' spacedtax'ially and circumferentially whereby said ring has both .aX-ial and radial resiliency, said ends being constituted by lugs which can be engaged to compress the ring radially for installation and removal, said ring being in peripheral contact in said groove While engaging the lock cylinder and the casing at said respective tends, said circumferential groove having a width in an axial direction greater than the thickness of said retaining ring, said ring having an axial dimension of a magnitude relative to the width of the groove such that the ring fills the Width of the groove subject to displacement by said cylinder, the axial position of said ring relative to said casing being in all conditions restricted to the confines of the axial extent of said groove, said lock cylinder including first and second end portions and having such an axial length that When said first end portion thereof abuts the first end portion of said hollow cylindrical casing, the second end portion of said lock cylinder overlaps said circumferential groove.

References Cited by the Examiner UNTTED'STATES PATENTS 1,686,665 10/28 Jacobs 70-473 2,023,208 12/35 Olson 70-377 2,524,273 10/50 Saler ss s.s

FOREIGN PATENTS 540,299 1/3'1 Germany; JOSEPH D. SEERS, Primary Examiner. ALBERTH. KAMP-E, M. HE-NSON WOOD, 1a.,

Examiners. 

